Renesas X9319WP8I

Overview

X9319WP8I from Intersil is a digitally controlled potentiometer (XDCP™) with 10 kΩ end-to-end resistance, 100 wiper tap points, and nonvolatile memory for power-up recall. It functions as a three-terminal voltage divider or two-terminal variable resistor in precision analog trimming circuits, operating from 4.5 V to 5.5 V supply and supporting terminal voltages up to +10 V.

For engineers reviewing the X9319WP8I datasheet, X9319WP8I pinout, X9319WP8I application, or X9319WP8I equivalent, this device is selected for DC bias adjustment, laser diode bias control, gain/offset trim, and LCD bias applications where solid-state reliability, ratiometric temperature stability (±20 ppm/°C), and 100,000-cycle endurance are critical.

Technical Context

The X9319WP8I implements a 99-element resistor array with make-before-break wiper switching, driven by a 7-bit up/down counter controlled via CS, U/D, and edge-triggered INC inputs. Wiper position is stored in nonvolatile memory only when CS rises while INC is HIGH - a dedicated store sequence preventing accidental writes.

Its operation requires strict power-up sequencing: CS and INC must be high before or concurrently with VCC ramping, and full parameter compliance begins 1 ms after VCC stabilizes. The device exhibits ±1% absolute linearity and ±0.2% relative linearity across its 0–99 tap range, with wiper resistance typ. 40 Ω and max. 200 Ω.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (150 mil, Pb-free, RoHS compliant), per JEDEC MS-012 and package drawing M8.15E.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digitally controlled potentiometer applications.

Compared with AD5243BRMZ10 and MCP41010-I/P, the X9319WP8I offers deterministic power-up behavior without MCU intervention, simpler 3-wire control, and superior long-term stability due to its ratiometric tempco and 100,000-cycle endurance - making it optimal for unattended or safety-critical analog calibration.

Availability

X9319WP8I is available at Aetrix Electronics and suitable for LCD bias control, laser diode bias control, and voltage regulator output control requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for X9319WP8I includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Intersil Corporation, now part of Renesas Electronics, designs high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The X9319WP8I belongs to Intersil's XDCP™ family of digitally controlled potentiometers, engineered for analog system calibration where mechanical potentiometer limitations - wear, size, and environmental sensitivity - must be eliminated.

FAQ

What is the power-up behavior of the X9319WP8I?

The X9319WP8I automatically recalls the last stored wiper position from nonvolatile memory upon power-up, provided proper power sequencing is followed (CS and INC held high before VCC ramp). This ensures repeatable startup voltage or resistance without MCU initialization. The wiper becomes stable within 500 µs after VCC reaches final value, and full electrical specifications apply only after 1 ms. The X9319WP8I does not default to mid-scale or zero - it restores the exact previously stored tap.

Can the X9319WP8I be used with supply voltages other than 5 V?

The X9319WP8I is specified for VCC = 4.5 V to 5.5 V, with all DC and AC parameters guaranteed across that range. Operation outside this window risks undefined behavior, including incorrect wiper positioning or failure to store to nonvolatile memory. Terminal voltages (RH, RL, RW) may reach up to +10 V independently, but the device itself must be powered within its rated supply range. The X9319WP8I is not rated for 3.3 V operation - attempting to run it at 3.3 V will result in unreliable communication and potential failure to increment/decrement the wiper counter.

How is nonvolatile memory programmed in the X9319WP8I?

Nonvolatile memory in the X9319WP8I is written only when CS transitions from LOW to HIGH while the INC input is simultaneously HIGH - a deliberate store sequence that prevents accidental writes during normal wiper adjustment. No separate command or timing window is required beyond this edge condition. The store operation completes in 20 ms (tCPHS), after which the device enters standby mode. The X9319WP8I does not support partial-store or byte-write operations; the entire 7-bit wiper position is saved atomically each time the store condition is met.

What is the maximum allowable voltage across RH and RL terminals of the X9319WP8I?

The X9319WP8I allows up to +10 V between RH and RL terminals (VRH/RL), with either terminal referenced to VSS (ground). This rating applies regardless of wiper position and supports use in high-voltage analog feedback paths, such as adjustable regulator outputs or op-amp gain-setting networks. Exceeding +10 V risks permanent damage to the internal resistor array or switches. The X9319WP8I is not intended for AC-coupled or bipolar voltage applications - all terminal voltages must remain ≥0 V relative to VSS.

Does the X9319WP8I support bidirectional wiper movement during a single CS activation?

Yes - the X9319WP8I supports dynamic reversal of wiper direction during a single chip-select session. While CS remains LOW, the U/D input may be toggled to switch between increment and decrement modes without deselecting the device. This enables fine-grained "hunt-and-peck" trimming: for example, moving up until overshoot occurs, then immediately moving down to settle at the optimal tap. The X9319WP8I does not require CS reassertion between direction changes, reducing control overhead and enabling responsive real-time calibration in closed-loop systems.